Troubleshooting guide

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ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 8 Troubleshooting Tag and MPLS Switching Connections
Troubleshooting MPLS ATM Connections
via 104.0.0.4, 0 dependencies, recursive
next hop 100.0.0.2, POS10/0/0 via 104.0.0.4/32
valid cached adjacency
tag rewrite with
Recursive rewrite via 104.0.0.4/32, tags imposed {18}
101.0.0.0/8, version 8, cached adjacency 11.0.0.1
0 packets, 0 bytes
tag information set
local tag: 20
via 11.0.0.1, 0 dependencies, recursive
next hop 11.0.0.1, GigabitEthernet2/0/1 via 11.0.0.1/32
valid cached adjacency
tag rewrite with Gi2/0/1, 11.0.0.1, tags imposed: {}
105.0.0.0/8, version 66, cached adjacency to POS10/0/0
0 packets, 0 bytes
tag information set
local tag: VPN-route-head
fast tag rewrite with
Recursive rewrite via 104.0.0.4/32, tags imposed {19}
via 104.0.0.4, 0 dependencies, recursive
next hop 100.0.0.2, POS10/0/0 via 104.0.0.4/32
valid cached adjacency
tag rewrite with
Recursive rewrite via 104.0.0.4/32, tags imposed {19}
172.20.0.0/16, version 9, cached adjacency 11.0.0.1
0 packets, 0 bytes
tag information set
local tag: 21
via 11.0.0.1, 0 dependencies, recursive
next hop 11.0.0.1, GigabitEthernet2/0/1 via 11.0.0.1/32
valid cached adjacency
tag rewrite with Gi2/0/1, 11.0.0.1, tags imposed: {}
224.0.0.0/24, version 2, receive
255.255.255.255/32, version 1, receive
8540-ATM-PE1#
Step 9 Veri fy:
• That the tag information set with the local tag field confirms that the labels are used effectively.
• That the fast tag rewrite field displays a stack of (at least) two labels used for VPN destinations.
Step 10 Check the Adjacency Table fields. They should show connections to the IP address of the CE (customer
equipment) router and the PE (provider edge) switch router. If they do not, check the MPLS connection
configurations.
Pinging ATM VPN Connections
Follow these steps to verify the ATM MPLS VPN connections:
Note Before establishing an MPLS VPN, you must be able to ping, for example, the “8540-ATM-PE1”
ATM switch router (2.0.0.1) from “8540-ATM-PE2” (3.0.0.2), and vice-versa.
To see whether the VRF works, use the ping command.